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[base] Fix support for format 13 charmaps.

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According to the OpenType specification of the 'cmap' table, the pair (0,6)
for platform and encoding IDs is used for format 13 charmap tables.  Commit
ba6f3e18 (from 2017-01-17) introduced the `TT_APPLE_ID_FULL_UNICODE` macro
(i.e., encoding_id == 6, added to OpenType 1.8); however, the corresponding
cmap selection code wasn't updated.

Unicode's Last Resort font (https://github.com/unicode-org/last-resort-font)
can be used to test a format 13 charmap.

Fixes issue #1383.

* src/base/ftobjc.s (find_unicode_charmap): Support
  `TT_APPLE_ID_FULL_UNICODE`.

Signed-off-by: Celeste Liu <uwu@coelacanthus.name>
This commit is contained in:
Celeste Liu
2026-01-04 01:35:57 +08:00
committed by Werner Lemberg
parent fc85a25584
commit 914b474030
1 changed files with 4 additions and 1 deletions
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5
src/base/ftobjs.c
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@@ -1413,7 +1413,10 @@
if ( ( cur[0]->platform_id == TT_PLATFORM_MICROSOFT &&
cur[0]->encoding_id == TT_MS_ID_UCS_4 ) ||
( cur[0]->platform_id == TT_PLATFORM_APPLE_UNICODE &&
cur[0]->encoding_id == TT_APPLE_ID_UNICODE_32 ) )
cur[0]->encoding_id == TT_APPLE_ID_UNICODE_32 ) ||
( cur[0]->platform_id == TT_PLATFORM_APPLE_UNICODE &&
cur[0]->encoding_id == TT_APPLE_ID_FULL_UNICODE &&
FT_Get_CMap_Format( cur[0] ) == 13 ) )
{
face->charmap = cur[0];
return FT_Err_Ok;